The A’s have called up outfielder Jake Smolinski from Triple-A Nashville to replace injured right fielder Josh Reddick, who was placed on the 15-day disabled list Friday afte fracturing his left thumb the night before.

Reddick was injured sliding on an attempted steal of second during the A’s 4-1 loss to the New York Yankees at the Coliseum. The A’s haven’t said how long Reddick will be sidelined, but expectations are at least a month.

Reddick’s injury is a damaging one for an A’s team that appeared to be playing better after a woeful start to the month of May. Besides providing Gold Glove defense in right, Reddick was hitting .322 with five homers and 18 RBI. His average was .468 over his last 14 games.

Smolinksi, 27, was hitting .248 with three home runs and 15 RBI in 39 games with Nashville. The right-handed hitter got off to a bad start but was 8-for-17 (.471) in his past five games for Nashville, including two homers, six runs scored and four RBI.